Hadith 1810
Chapter 47: Women participating in military expeditions with the men - كتاب الجهاد والسير
حَدَّثَنَا يَحْيَى بْنُ يَحْيَى، أَخْبَرَنَا جَعْفَرُ بْنُ سُلَيْمَانَ، عَنْ ثَابِتٍ، عَنْ أَنَسِ بْنِ مَالِكٍ، قَالَ كَانَ رَسُولُ اللَّهِ صلى الله عليه وسلم يَغْزُو بِأُمِّ سُلَيْمٍ وَنِسْوَةٍ مِنَ الأَنْصَارِ مَعَهُ إِذَا غَزَا فَيَسْقِينَ الْمَاءَ وَيُدَاوِينَ الْجَرْحَى .
It has been narrated on the authority of Anas b. Malik who said that the Messenger of Allah (ﷺ) allowed Umm Sulaim and some other women of the Ansar to accompany him when he went to war; they would give water (to the soldiers) and would treat the wounded.
Reference : Sahih Muslim 1810
In-book reference : Book 32, Hadith 164
USC-MSA web (English) reference : Book 19, Hadith 4454